/Engine/Plugins/Online/OnlineSubsystemUtils/Source/OnlineSubsystemUtils/Public/VoiceEngineImpl.h
Sets the playback priority of a remote talker for the given user. A priority of 0xFFFFFFFF indicates that the player is muted. All other priorities sorted from zero being most important to higher numbers being less important.
0 upon success, an error code otherwise
virtual uint32 SetPlaybackPriority ( uint32 LocalUserNum, const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & RemoteTalkerId, uint32 Priority )